I think the simplest way to 'balance' would be to have the weapons function as intended. Hand cannons/shotguns for close range, autos/fusion for medium, scout/sniper for long range. Damage output wouldn't be as much of a concern if they did that. Then your tactics would be important again. I'm curious how most players would fare if you gave everyone the same weapons and armor! That would separate the scrubs from the actual skilled.